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首页> 外文期刊>Energy & fuels >Conversion of Polyethylene into Transportation Fuels by the Combination of Thermal Cracking and Catalytic Hydroreforming over Ni-Supported Hierarchical Beta Zeolite
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Conversion of Polyethylene into Transportation Fuels by the Combination of Thermal Cracking and Catalytic Hydroreforming over Ni-Supported Hierarchical Beta Zeolite

机译：镍负载的β-沸石分子筛的热裂解与催化加氢重整相结合将聚乙烯转化为运输燃料

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摘要

The oil obtained from the thermal cracking of low-density polyethylene (LDPE) is formed mainly by linear hydrocarbons with a high quantity of olefins, which hinders the possible application of this product in the formulation of transportation fuels. However, hydroreforming of this oil using bitunctional catalysts with high accessibility to the active sites would allow for the properties of the gasoline and diesel fractions to be significantly upgraded. This is the case of the catalyst employed here because it consists of hierarchical Beta zeolite (with a bimodal micro-mesoporosity) and containing 7 wt % Ni. The presence of nickel in the catalyst increased the share of gasolines with regard to the h-Beta support The effect of the main variables involved in the hydroreforming process has been investigated and optimized, showing that the extent of hydrocracking is favored when increasing the temperature, the pressure, and the catalyst/feed ratio, leading to enhanced gasoline yields at the expense of heavy (C_(19)-C_(40)) and especially light (C_(13)-C_(18)) diesel fractions because of the fester diffusion of the latter. Ni/h-Beta proved to be an especially adequate catalyst for obtaining gasolines; therefore, a maximum in the selectivity toward gasoline (up to 68.7%) was found in the hydroreforming at 40 bar of hydrogen pressure. On the other hand, the values of the bromine index indicated that 80-100% of the olefins present in the raw oil were hydrogenated depending upon the reaction conditions. In addition, the Ni/h-Beta catalyst showed high activity for aromatization and, especially, hydroisomerization reactions. Thus, a 53% share of isoparamns in the gasolines was obtained at long reaction times. The gasoline and diesel fractions obtained showed a high research octane number (RON) (>80) and cetane indexes above specifications (>70), respectively, which is indicative of their high quality as transportation fuels.
机译：从低密度聚乙烯（LDPE）热裂解获得的油主要由具有大量烯烃的直链烃形成，这阻碍了该产品在运输燃料配方中的可能应用。但是，使用具有高活性位点的双官能催化剂对该油进行加氢重整将使汽油和柴油馏分的性能得到显着提高。此处使用的催化剂就是这种情况，因为它由分层的β沸石（具有双峰微介孔率）组成，并含有7 wt％的Ni。催化剂中镍的存在相对于h-β载体而言增加了汽油的份额。已经研究和优化了加氢重整过程中涉及的主要变量的影响，结果表明，当温度升高时，加氢裂化的程度会增加，压力和催化剂/进料比导致汽油产量增加，但柴油的馏分重（C_（19）-C_（40））特别是轻度（C_（13）-C_（18）），这是因为后者恶化。事实证明，Ni / h-Beta是获得汽油的特别合适的催化剂。因此，在氢气压力为40 bar的加氢重整中，发现对汽油的选择性最高（高达68.7％）。另一方面，溴指数的值表明，取决于反应条件，存在于粗油中的烯烃的80-100％被氢化。另外，Ni / h-Beta催化剂显示出高的芳构化活性，尤其是加氢异构化反应。因此，在较长的反应时间下，汽油中异戊烷的含量为53％。获得的汽油和柴油馏分分别显示出较高的研究辛烷值（RON）（> 80）和十六烷值指数高于规格（> 70），这表明它们作为运输燃料的品质很高。

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  • 来源
    《Energy & fuels》 |2012年第mayajuna期|p.3187-3195|共9页
  • 作者

    J. M. Escola; J. Aguado; D. P. Serrano; L. Briones; J. L. Diaz de Tuesta; R. Calvo; E. Fernandez;

  • 作者单位

    Department of Chemical and Environmental Technology, Carlos University, c/Tulipan s, 28933 Mostoles, Madrid, Spain;

    Department of Chemical and Environmental Technology, Carlos University, c/Tulipan s, 28933 Mostoles, Madrid, Spain;

    Department of Chemical and Energy Technology, ESCET Rey Juan Carlos University, c/Tulipan s, 28933 Mostoles, Madrid, Spain,IMDEA Energy Institute, c/Ramon de la Sagra 3, 28935 Mostoles, Madrid, Spain;

    Department of Chemical and Environmental Technology, Carlos University, c/Tulipan s, 28933 Mostoles, Madrid, Spain;

    Department of Chemical and Environmental Technology, Carlos University, c/Tulipan s, 28933 Mostoles, Madrid, Spain;

    URBASER, Avenida de Tenerife 4, 28703 San Sebastian de los Reyes, Madrid, Spain;

    URBASER, Avenida de Tenerife 4, 28703 San Sebastian de los Reyes, Madrid, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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